Delete 'rm -rf %buildroot' after %install, per Packaging Guidelines
More minor fixes for fedora-review

- Document patches
- "Fully versioned dependency in subpackages"
  - Requires:   %{name}%{?_isa} = %{version}-%{release}
- Rpmlint error about installed 0-length header file

Formatting changes:
- Fit within 80 columns